Trimmer for knitting-machines



(No Model.) W E TRIMMER FOR KNITTING MACHINES.

Patented Jan.27,1891.

WITNES SE8.

"ijwrrian Starts aren't FFICE.

IVILLIAM E. OAHILL, OF UTIGA, NEIV YORK.

TRIMMER FOR KNlTTlNG-MACHINES.

SPECIFICATION forming part of Letters Patent No. 445,423, dated January 27, 1891.

Application filed J 11118 1 To aZZ whom it may concern:

Be it known that I, \VILLIAM E. CAHILL, a citizenof the United States, residing atUtica, in the county of Oneida and State of New York, have invented certain new and useful Improvements in Trimmers for Knittingfliachines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has relation to a trimmingdevice for circular-knitting machines; and it consists in the construction and novel arrangement of parts, as hereinafter more fully set forth, illustrated in the accompanying drawings, and pointed out in the appended claims.

The object. of my invention is to provide a simple and inexpensive automatically-operated trimming attachment for circular-knitting machines which employ an automatic striping device.

All automatic striping mechanism operates by changing the yarn-that is, by cutting out a thread of one color and substituting one of another. By this operation long ends are left hanging or attached to the fabric being knitted, and after the fabric is removed from the machine these ends have tobe cut off by hand.

Vith my invention attached to a circularknitting machine on which an automatic striping attachment is used these ends are automatically cut off and removed while the fabric is being knit.

In the drawings, Figure 1 is aside elevationof myimproved trimming device attached to a circular-knitting machine. Fig. 2 is a plan of the trimming device. Fig. 3 is a horizontal section on the line at a; of Fig. 1. Fig. at is a horizontal section on the line y 9 of Fig. 1. Fig. 5 is a plan of a modified form of knife used on my trimming device. Fig. 6 is another modified form of knife used on my trimming device.

Referring to the accompanying drawings, in which like letters of reference indicate corresponding parts in all the figures, the letter A designates a bracket attached by means of bolts (1. to the frame-work of the knitting-machine,and is provided near its upper end with Serial No. 3 5 5 I 6 l 2. (No model.)

laterally-extending pins (5 threaded on their outer ends and provided with set nuts, and which work in elongated slots 7), formed in an extension The letter Z) designates a latcrallyextend; ing perforated arm made integral with the extension B. V

The letter C designates a bracket consisting of the vertical main portion 0 and provided at its upper and lower ends with the laterally-extending arms 0 0 The main portionc of the bracket C is provided near its central part With a perforated lug o by means of which the bracket is pivoted to the arm I) of the extension 13 by a bolt 0.

Journaled in suitable bearings formed in the arms 0' c is a shaft D, which carries at its lower end a gear-wheel D, the teeth of which work in the spaces (1, between the needles D of the cylinder D as shown in Figs. 1. and 4.

Rigidly secured to the shaft D, immediately above the points of the needles D by means of collars c, is a circular knife E, the cutting-edge of which is formed by grinding away on one side of the plate forming the knife, making its edge outwardly beveled, as shown in Fig. 1, the object of which will be presently explained.

Journaled in a suitable bearing formed near the outer end of the arm 0 is a dependent shaft F, having rigidly secured at its lower end a circular knife F, similar in construction to the knife E.

The shafts D and F carry at their upper ends intermcshing gear-wheelsff, and journaled in a bearing formed in an arm g, extending at right angles to the arm a, isa dependent shaft G, which carries at its upper end a gear-wheel G.

It will be noticed in Fig. 1 that the metal forming the knife E is ground away upon its lower face, while the metal forming the knife F is ground away on its upper face, and as these knives overlap one another, as shown in Fig. 3, it will be seen that a perfect cutting-edge is formed.

In order that the ends of the yarn which are brought between the knives E F by the rotation of the needle-heads may not lodge on the machine as they are cut from the fabric nor clog the knives, I secure to the lower edge of the shaft G a brush (i the lower edge of which rests upon the knives E and F.

Owing to the vertical adjustn'ient of the knives E and-F by means of the slotted extension B, my automatic trimming device may be readily adjusted to any make of circular-knitting machines. a

In Figs. 5 and (i I have shown modified forms of the knives, that shown in Fig. 5 consisting of three knives, two of which are mounted upon one shafta sufficient distance apart to allow of the third knife, carried 011 a second shaft, to work between, as plainly of said shafts engaging with the needles,sub-

shown.

In Fig. 6 the knives are constructed with saw-teeth edges. Any of the above-described knives may be used on my automatic triminer for cutting the ends of the yarn from the fabric while it is being knitted without having to do it by hand after the fabric has been removed from the machine, as is now the practice.

The operation of my improved automatic trimmer, taken in connection with the above description and the accompanying drawings, may be briefly described as follows: Motion havingbeen imparted to theknitting-machin e, the knives are caused to revolve through the media of the gear-wheels D f f, and as the fabric is knitted and passes the knives the ends of the yarn are severed close to the f abric and brushed from the machine and knives by the brush G operated through the media of the gear-wheelsf G.

I do not desire to limit myself to the precise construction herein shown and described,

as many minor changes may be made without departing from the spirit of my invention. Having thus fully described my invention, What I claim, and desire to secure by Letters Patent, is

1. In a knitting-machine, the combination, with the revolving needle-cylinder, of a shaft provided with a circular trimming-blade and actuated by means of a spur-wheel secured to sald shaft and meshing with the needles of the needle-cylinder, a similar shaft provided with a cutting-blade, and internieshing gear secured to these shafts, whereby both are opr erated by the needle-cylinder, substantially as and for the purpose set forth.

2. In a knitting-machine, the combination,

with the needle-cylinder, of a vertically-adjustable frame carrying a pair of shafts provided with circular trim min g-blades arranged to operate in conjunction, a spur-wheel secured to one of said shafts and meshing with the needles of the needle-cylinder, and gearwheels secured to said shafts, inter-meshing with each other, whereby both shafts are actustant-ially as described.

4. The combination, in a knittlng-machine, with the revolving needle-cylinder, of an upright arm having laterally-extending pins, a.

supplemental arm provided with slots through which the pins extend, set-nuts on the pins, a frame pivoted to the supplemental arm, carrying two dependent shafts provided with circular trimmingknives operatirg in conjunction, and a brush-shaft, intermeshing gears connecting the shafts at their tops or upper ends, and a toothed Wheel on one of the knife shafts engaging the needle-cylinder, whereby the shafts are operated by the needle-cylinder, substantially as and for the purpose described.

5. In an automatic trimmer for knittingmachines, the combination, with the needlecylinder, of a frame, shafts mounted in said frame, two of which carry circular trim mingblades and a third a rotary brush, and operative connections between said shafts, whereby two areactuated from one, the actuating-shaft be ing adapted to receive motion from the needlecylinder, substantially as and for the purpose described.

6. In a knittingunachine, thecombination,

with the needle-cylinder, of dependent shafts v WILLIAM E. OAI'IILL.

Witnesses:

J. E. MCLOUGHLIN, T. J. BowNE.

IIO 

